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A frequency deviation estimation device and its method

A frequency offset estimation and time slot technology, which is applied in the field of frequency offset estimation devices, can solve the problems of high overhead, and the estimation accuracy cannot fully meet the requirements of high-order modulation.

Inactive Publication Date: 2010-06-16
ST ERICSSON SEMICON BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the joint detection is dedicated to frequency offset estimation, the overhead will be large
Moreover, the estimation accuracy of this method still cannot fully meet the needs of high-order modulation

Method used

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  • A frequency deviation estimation device and its method
  • A frequency deviation estimation device and its method
  • A frequency deviation estimation device and its method

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Embodiment Construction

[0030] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be described in detail below by taking the application of the present invention in TD-SCDMA terminals as an example in conjunction with the accompanying drawings and specific embodiments.

[0031] The present invention utilizes Midamble receiving data of two downlink service time slots to perform frequency offset estimation, and is applicable to: a user (UE) simultaneously occupies two or more time slot services; or a user's downlink service occupies two non- The same code channel of a full slot, and the other code channels are empty.

[0032] The basic principles are as follows:

[0033] When there is no frequency offset, the received Midamble data can be expressed as:

[0034] R=GH+n (1)

[0035] Among them, R is the received data of Midamble, G is the transformation matrix formed by the basic Midamble code, H is the channel impulse response, ...

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Abstract

The invention is concerned with the estimating equipment of the frequency deviation and the method. It includes that obtain two time slot of the training sequence data from the receiving data; the conjugation of one of the training sequence transposes to the other ones product; and calculate the frequency deviation by the product. It improves the precision for estimating the TD-SCDMA terminal frequency deviation.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, in particular to a frequency offset estimation device and method used in a Time Division Synchronous Code Division Multiple Access (TD-SCDMA) terminal. Background technique [0002] In a wireless communication system, there is always a certain frequency deviation between the carrier frequency and the local crystal oscillator. Only by estimating the frequency deviation as accurately as possible can the frequency deviation adjustment / compensation be performed to achieve a frequency deviation acceptable to the receiver, thereby performing data demodulation. The accuracy of frequency offset estimation will directly affect the demodulation performance, especially the demodulation of high-order modulated signals (such as 16QAM, 64QAM). So how to quickly and effectively estimate the frequency deviation, and then quickly and accurately adjust the frequency deviation is a key part directly r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/707H04J13/02H04L27/26
Inventor 牟秀红许百成李燮
Owner ST ERICSSON SEMICON BEIJING